Problem waking up monitor

[danym]

Hello people !
i've got a question about my monitor or smthing like that. I'm using AMD HD5450. When I turn on vsync through AMD Control Center then my monitor wont wake up from sleep. Nothing happens.... I try with mouse or keyboard but nothing happens... Only reset button saves me. It works great when vsync is disabled. I'm using MINT MAYA 13 with KDE. Any suggestions?